[fix] charts: no intersect needed for tooltip

Added intersect: false option to Chart.js charts, because currently we have to place the cursor exactly on the lines to display tooltip, which is quite hard and not convenient.

Sorry but i really prefer when intersect: true (default). I don't to show to many details, but only when user really want it.

I understand, but it doesn't show details until the user puts the cursor on the chart, and when details are shown, there aren't more than without intersect: true (so if it's too many, then it's already too many without this commit).